Are you talking about the Artisan feats? (i.e. the cost reduction or craft time reduction feats that can be taken multiple times)

If not, then it's something that's been disabled for now. Either because it's not done, or because they're placeholders.

Some other things are like that, such as the Blood Magus class or whatever it's called, and the Stigmata feat, among other things.

They're either things that someone was working on but they're no longer with the PRC (such as Strat's Blood Magus) or things that have been temporarily abandoned because no one's managed to get them to work properly, or they're too buggy.